Newton's Second Law

In the diagram below, a box is on a frictionless horizontal surface with forces F₁ and F₂ acting shown. If the magnitude of F₁ is greater than the magnitude of F₂ , then the box is

• moving at constant speed in the direction of F₁

• accelerating in the direction of F₁

• moving at constant speed in the direction of F₂

• accelerating in the direction of F₂

If the sum of all the forces acting on a moving object is zero, the object will

• accelerate uniformly

• slow down and stop

• continue moving with constant velocity

• change the direction of its motion

In which situation is the net force on the object equal to zero?

• a bicycle moving at constant speed on a straight, level road

• an automobile braking to a stop

• a satellite moving at constant speed around Earth in a circular orbit

• a pitched baseball being hit by a bat

Which of the following bodies has a net force of zero?

• a projectile at the highest point in its trajectory

• a car moving with a constant speed along a straight, level road

• a satellite orbiting Earth in a circular orbit

• a ball falling freely toward the surface of Earth

Which one of the following bodies has a net force of zero?

• a satellite moving around Earth in a circular orbit

• a cart rolling down a frictionless incline

• an apple falling freely toward the surface of Earth

• a block sliding at constant velocity across a tabletop

Which of the following graphs best represents the motion of an object with no net force?

• A

• B

• C

• D

Which two graphs represent the motion of an object on which the net force is zero?

• A

• B

• C

• D

Which mass would have the greatest acceleration if the same unbalanced force was applied to each?

• 1 kg

• 2 kg

• 3 kg

• 4 kg

If the net force acting on an object is doubled, the acceleration of the object is

• halved

• unchanged

• doubled

• quadrupled

A force of F Newtons gives an object with a mass of M an acceleration of A. The same force F will give a second object with a mass of 2M an acceleration of

• A/2

• A

• 2A

• A/4